The Messenger of Allah ﷺ said, "Allah has added a prayer for you beyond your prescribed prayers, one that is better than red camels. It is the two rakahs before the Fajr prayer."
قال رسول الله ﷺ: إن الله زادكم صلاة إلى صلاتكم هي خير من حمر النعم، ألا وهي الركعتان قبل صلاة الفجر.
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Bayhaqi (2/469) narrated it from Abu Abdullah Hafiz (that is, Hakim), who said, Abu Hasan Ahmad bin Jinah Kashani told me, Umar bin Muhammad bin Bujayr told us, Abbas bin Walid Khallal told us, Marwan bin Muhammad Dimashqi told us, Muawiya bin Salam told us, from Yahya bin Abu Kathir, from Abu Nadra Abdi, from Abu Saeed Khudri, who said, and then he related it.Its chain is hasan on account of Abbas bin Walid Bayruti, for his hadith is hasan. Bayhaqi said, "This is a hadith that Yahya bin Main found gharib, and he praised Muawiya bin Salam, and Muhammad bin Ishaq bin Khuzayma regarded it as good."I say, this is because it is well known that the prayer that was added to the five is Witr.